How Old Is Everyone In The Riverside Crew?

In River of Sorrows, everyone is a high school junior. Leon skipped a grade so he's a year younger than everyone else. 

Book 2 happens a year later during the summer. It ends at the beginning of their senior year. Book 3 happens during their entire senior year and possibly a future time skip. 

1. Felix: Newly 18 (Birthday is June 10th)
2. Rigel: Newly 18 (Birthday is January 17th)

3. Leon: Newly 17 (Birthday is June 24th)

4. Aaron: Still 17 (Birthday is October 16th)

5. Finn: Newly 19 (Birthday is May 24th) *He was held back*

6. Zach: Newly 18 (Birthday is February 9th)

7. Kathleen: Still 17 (Birthday is September 21st)

8. Raelyn: Still 17 (Birthday is November 14th)

9. Amber: Newly 18 (Birthday is July 20th)

10. Lea: Newly 18 (Birthday is July 26th)

11. Bethany: Still 17 (Birthday is December 12th)

12. Alice: Still 7 (Birthday is December 23rd) *She's not a teen or a high schooler (obviously) but she's a new character and she's related to someone else here*